Koa Devstack Sleuth

Koa middleware for traceability of requests, based on the spring sleuth headers

Usage

This middelware is a distributed tracing solution for Koa v2, borrowing heavily from Dapper.

Example

var koa = require('koa');
var sleuth = require('koa-devstack-sleuth');
var app = new koa();
app.use(sleuth());

However if you want to use in microservices, in this version of koa-devstack-sleuth, you need add the header before call to other microservices. If you use request-promise see example below:

 
var options = {
    uri: 'https://api.github.com/user/repos',
    qs: {
        access_token: 'xxxxx xxxxx' // -> uri + '?access_token=xxxxx%20xxxxx'
    },
    headers: {
        'X-B3-SpanId': ctx.get('X-B3-SpanId'),
        'X-B3-TraceId': ctx.get('X-B3-TraceId')
    },
    json: true // Automatically parses the JSON string in the response
};
 
rp(options)
    .then(function (repos) {
        console.log('User has %d repos', repos.length);
    })
    .catch(function (err) {
        // API call failed...
    });

Additional Information

If you want to use this library, you need at least node v.7 and Harmony.